74 • Chapter 6: Maintenance HS-04 Operator’s Manual
Replacing the Humidity Filter
1. Verify that the HS-04 is off.
2. Remove the rubber boot, if installed.
3. Use a small Phillips screwdriver to unscrew the 4 screws that attached the front case to the
rear case.
4. Turn the instrument right side up. The screws are not captive and may fall out. Be sure not to
lose them.
5. Remove the front case from the rear case.
6. Turn the front case upside down.
7. If the sensor stayed in the front case, remove the sensor.
Figure 11: Unscrewing Case Screws
Figure 12: Case Separation
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